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SN74ACT7882-20FN データシート(PDF) 11 Page - Texas Instruments

部品番号 SN74ACT7882-20FN
部品情報  CLOCKED FIRST-IN, FIRST-OUT MEMORY
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SN74ACT7882-20FN データシート(HTML) 11 Page - Texas Instruments

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SN74ACT7882
2048
× 18
CLOCKED FIRST-IN, FIRST-OUT MEMORY
SCAS445C – JUNE 1994 – REVISED APRIL 1998
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (see Figures 1 through 5)
’ACT7882-15
’ACT7882-20
’ACT7882-30
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
fclock
Clock frequency
67
50
33.4
MHz
WRTCLK high
5
7
8.5
WRTCLK low
6
7
11
tw
Pulse duration
RDCLK high
5
7
8.5
ns
RDCLK low
6
7
11
DAF high (default AF/AE value)
7
8
10
Data in (D0–D17) before WRTCLK
5
5
5
WRTEN1, WRTEN2 high before WRTCLK
4
5
5
OE, RDEN1, RDEN2 high before RDCLK
4
5
5
tsu
Setup time
Reset: RESET low before first WRTCLK
and RDCLK
↑†
5
6
7
ns
Define AF/AE: D0–D9 before DAF
5
5
5
Define AF/AE: DAF
↓ before RESET↑
4
6
7
Define AF/AE (default): DAF high before RESET
4
5
5
Data in (D0–D17) after WRTCLK
0
0
0
WRTEN1, WRTEN2 high after WRTCLK
0
0
0
OE, RDEN1, RDEN2 high after RDCLK
0
0
1
th
Hold time
Reset: RESET low after fourth WRTCLK
and RDCLK
↑†
0
0
0
ns
Define AF/AE: D0–D9 after DAF
0
0
0
Define AF/AE: DAF low after RESET
0
0
0
Define AF/AE (default): DAF high after RESET
0
0
0
† To permit the clock pulse to be utilized for reset purposes
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, CL = 50 pF (unless otherwise noted) (see Figure 5)
PARAMETER
FROM
TO
’ACT7882-15
’ACT7882-20
’ACT7882-30
UNIT
PARAMETER
(INPUT)
(OUTPUT)
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
fmax
WRTCLK or RDCLK
67
50
33.4
MHz
tpd
RDCLK
Any Q
3
12
3
13
3
18
ns
tpd‡
RDCLK
Any Q
WRTCLK
IR
2
8
2
9.5
2
12
t d
RDCLK
OR
2
8
2
9.5
2
12
ns
tpd
WRTCLK
AF/AE
6
17
6
19
6
22
RDCLK
AF/AE
6
17
6
19
6
22
tPLH
WRTCLK
HF
6
14
6
17
6
21
ns
tPHL
RDCLK
HF
6
14
6
17
6
21
ns
tPLH
RESET
AF/AE
3
12
3
17
3
21
ns
tPHL
RESET
HF
3
14
3
19
3
23
ns
ten
OE
Any Q
2
9
2
11
2
11
ns
tdis
OE
Any Q
2
10
2
14
2
14
ns
‡ This parameter is measured with CL = 30 pF (see Figure 6).


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